51787666 has 16 divisors (see below), whose sum is σ = 88994304. Its totient is φ = 22140864.

The previous prime is 51787657. The next prime is 51787669. The reversal of 51787666 is 66678715.

51787666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51787669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1791 + ... + 10333.

It is an arithmetic number, because the mean of its divisors is an integer number (5562144).

Almost surely, 2^51787666 is an apocalyptic number.

51787666 is a deficient number, since it is larger than the sum of its proper divisors (37206638).

51787666 is a wasteful number, since it uses less digits than its factorization.

51787666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8985.

The product of its digits is 423360, while the sum is 46.

The square root of 51787666 is about 7196.3647767467. The cubic root of 51787666 is about 372.7423847748.

The spelling of 51787666 in words is "fifty-one million, seven hundred eighty-seven thousand, six hundred sixty-six".